the list is far from exhaustive.....

ADI Ahmedabad
AGC Agra Cantonment
AJJ Arakkonam Junction
ALD Allahabad
AMI Amravati
AQ Ajni, a marshalling yard and suburb of Nagpur
ASN Asansol
ASR Amritsar
BAMY Bandra Marshalling Yard
BBS Bhubaneshwar
BBVT Bombay Victoria Terminus (now CSTM)
BCT Bombay Central (now MCT)
BKI Bikaner
BKSC Bokaro Steel City
BNC Bangalore Cantt.
BP Barrackpore
BPL Bhopal
BPO Baripada
BPQ Balharshah on the New Delhi - Chennai Trunk
BRC Vadodara Jn. (Baroda)
BSB Varanasi Jn. (formerly Benaras Cantt.)
BSL Bhusaval
BSP Bilaspur
BSR Vasai Road (from Bassein Road)
BT Barasat (?)
BWN Barddhaman
BZA Vijayawada (from the older "Beziawada")
CAPE Kanyakumari (from "Cape Comorin")
CBE CoimbatoreCDG Chandigarh
CHTS Cochin Harbour Terminus
CLAT Kurla (from "Coorla")
CNB Kanpur Central (from the older "Cawnpore"
COQ Cheoki
CPR Chhapra
MAS Chennai Central
CSTM Chatrapati Shivaji Terminus Mumbai (was BBVT)
DBG Darbhanga
DD Daund
DDN Dehradun
DEE Delhi Sarai Rohilla
DHB Dhanbad
DLI Delhi Junction (Old Delhi)
DR Dadar
ED Erode
ERS Ernakulam (formerly Ernakulam South)
ET Itarsi
ETI Etwari
FD Faizabad
FZR Ferozepore
G Gondia
GGP Gangapur City
GHY Guwahati
GIM Jamnagar
GKP Gorakhpur
GOC Golden Rock
GONDA Gonda
GTL GuntakalGWL Gwalior
GY Gooty
GZB Ghaziabad
NZM Hazrat Nizamuddin
HWH Howrah
HX Cudduppah
HYB Hyderabad
IGP Igatpuri
IND Indore
J Jalna
JAM Jamnagar
JAT Jammu Tawi
JBP Jabalpur
JHS Jhansi
JLN Jalgaon
JTJ Jolarpettai Junction
KGN Kurseong
KGP Kharagpur
KJM Krishnarajapuram
KLK Kalka
KLMG Kalamboli (KR)
KNW Khandwa
KOP Kolhapur
KTE Katni
KTT Kota
KYN Kalyan
KZJ Kazipet Jn. (KZP??)
LDH Ludhiana
LKO Lucknow (NR)
LJN Lucknow (NER)
LNL Lonavla
MAQ Mangalore
MAS Madras Central
MCT Mumbai Central (was BCT)
MDU Madurai
MFP Muzaffarpur
MGS Mughalsarai
MMR Manmad
MRJ Miraj
MS Chennai Egmore (from "Madras")
NDLS New Delhi
NGP Nagpur
NIR Nainpur
NJP New Jalpaiguri
NKJ New Katni Jn.
NYN Naini
NZM Hazrat Nizamuddin
PA Pune (formerly Poona)
PNBE Patna Junction
R Raipur
RC Raichur
RJT Rajkot
RRB Birur Junction
RTM Ratlam
RU Renigunta
SBI Sabarmati
SBC Bangalore City (from "South Bangalore City")
SC Secunderabad
SDAH Sealdah
SGNR Sri Ganganagar
SGU Siliguri
SLP Salpa
SMET Shimoga Town
SRC Santragachi
SSB Shakurbasti
STN Satna
SUR Sholapur
SWV Sawantwadi (on KR)
TDH Tindharia on the Darjeeling Himalayan Railway,
TDL Tundla
TKD Tughlakabad
TLGP Talaguppa
TPTY Tirupati
TVC Trivandrum Central
UBL Hubli
UDZ Udaipur
VKZ Venkatanarasingharajuvariapeta (50km south of Tirupati)
VR Virar
BSB Varanasi
VSG Vasco da Gama
VSKP Vishakhapatnam
VSRD Vasai Road
WAT WalTAIR